The Last Quest of Gilgamesh (The Gilgamesh Trilogy, #3)

In his final quest, Gilgamesh, still mourning the death of his dear friend Enkidu, sets out to find the key to immortality. His journey is perilous. He must fight ferocious serpents and wild lions. He travels through bitterly cold caves, across scorching deserts, and over the fatal waters of the Sea of Death. Finally he arrives at the palace of Utnapishtim, the only human who knows the secret of immortality. Utnapishtim sets Gilgamesh a test to stay away for six days and seven nights, but Gilgamesh fails. His last hope, a flower of eternal youth, is eaten by the goddess Ishtar, who exacts her revenge. Finally, Enkidu comes from the underworld to show Gilgamesh true immortality: the king will be remembered for his good deeds, courage, and love for his people.